藏北可可西里盆地老第三纪沉积物源区分析及其高原隆升意义

刘志飞; 王成善; 伊海生; 刘顺

藏北可可西里盆地老第三纪沉积物源区分析及其高原隆升意义

刘志飞^{1, 2},
王成善²,
伊海生²,
刘顺²

1.
同济大学海洋地质教育部重点实验室, 上海 200092
2.
成都理工学院沉积地质研究所, 成都 610059

基金项目:

国家重点基础研究专项经费资助项目 1998040800

国土资源部“九五”重大基础项目 9501101-02

详细信息

作者简介:
刘志飞, 男, 博士后, 1969年生, 1999年毕业于成都理工学院, 获理学博士学位, 目前主要从事青藏高原地质和海洋地质研究

中图分类号: P541;P512.2
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出版历程
- 收稿日期: 2000-07-31
- 刊出日期: 2001-01-25

PROVENANCE OF PALEOGENE SEDIMENTS IN HOH XIL BASIN, NORTH OF QINGZANG PLATEAU, AND ITS SIGNIFICANCE FOR PLATEAU UPLIFT

1.
Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
Institute of Sedimentary Geology, Chengdu University ofTechnology, Chengdu 610059, China

摘要

摘要: 可可西里盆地位于昆仑山和唐古拉山之间, 是青藏高原腹地最大的第三纪沉积盆地, 对于研究青藏高原早期隆升和地壳短缩过程具有重要作用.盆地保存的始新世—渐新世早期风火山群和雅西措群主要由碎屑岩和泥岩组成, 厚度为5 45 2.8m.碎屑岩的物源区分析表明, 风火山群主要来自于南部的唐古拉造山带二叠—三叠纪地层, 而雅西措群主要来自于南部的唐古拉、白日榨加和黑石山-高山造山带, 剥蚀深度加大至石炭—二叠纪地层.它们的沉积演化过程是盆地南部造山带老第三纪构造隆升持续加强的结果, 表明在雅西措群沉积时期青藏高原北部已经隆升至一定的高度.
- 物源区 /
- 高原隆升 /
- 老第三纪 /
- 可可西里盆地 /
- 青藏高原
Abstract: The Hoh Xil basin, the largest Tertiary sedimentary basin in the hinterland of the Qingzang plateau between the Kunlun Mountain and the Tanggula Mountain, may be significant for the research into the early uplift and the crustal shortening of the plateau. The 5 452.8 m-thick Eocene-Early Oligocene Fenghuoshan and Yaxicuo groups preserved in the basin consist mainly of clastic rocks and mudstone. The analysis of the clastic-rock provenance shows that the Fenghuoshan Group originated mainly from the Permian-Triassic strata in the Tanggula orogenic zone in the south, and that the Yaxicuo Group originated mainly from the Carboniferous-Permian strata in the Tanggula, Bairizhajia, and Heishishan-Gaoshan orogenic zones in the south. These sedimentary evolutionary process results from the persistent strengthening of the Paleogene tectonic uplift of the orogenic zone in the southern Hoh Xil basin, indicating that the north of the Qingzang plateau had already been uplifted to a certain height in the sedimentary period of the Yaxicuo Group.
- provenance /
- tectonic uplift /
- Paleogene /
- Hoh Xil basin /
- Qingzang plateau

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图 1 青藏高原北部可可西里盆地地质简图

显示新生代沉积、盆地基底分布以及构造轮廓, 构造轮廓据文献[6, 9]修改.1.第四纪/覆盖; 2.五道梁群; 3.雅西措群; 4.风火山群; 5.前第三系基底; 6.湖泊; 7.逆冲断层; 8.山峰; 9.居民区; 10.山口; 11.河流; 12.公路; BT.巴颜喀拉地体; QT.羌塘地体; SKSZ.昆仑南缘缝合带; JRSZ.金沙江缝合带

Fig. 1. Simplified geologic map of the Hoh Xil basin, northern Tibet

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图 2 可可西里盆地风火山群砂岩碎屑成分QtFL (A) 和QmFLt (B) 图解

Qt.石英颗粒总数; Qm.单晶石英; F.单晶长石总数; L.不稳定岩屑; Lt.多晶质岩屑

Fig. 2. Framework-grain QtFL (A) and QmFLt (B) composition of the Fenghuoshan Group sandstones in the Hoh Xil basin

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图 3 可可西里盆地风火山群(A) 和雅西措群(B) 沉积物等厚图

表示盆地两个阶段演化的古水流、盆地沉积中心、构造轮廓, 沉积物厚度值据文献③计算.1.沉积物等厚线, m; 2.古水流玫瑰花图; 3.数据量; 4.逆冲断层; 5.山峰; 6.居民区

Fig. 3. Sediment isopach maps of the Fenghuoshan Group (A) and the Yaxicuo Group (B) in the Hoh Xil basin

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